battery issue

i am on the verge of breathing life into my series 3 109 after replacing all the perishable engine bits i need to put a new battery on it and here lies my quandery there is a battery tray under the bonnet in front of the airfilter with all the leads but there is also one under the passenger seat i would prefer to use the one under the seat as its much bigger but why are there two the battery is under the bonnet at the mo but does not look big enough to start a watch

i use the underbonnet tray and the battery that fits is enough to turn over my v8,what more do you need?

My battery's unner the passenger seat & looks weeny, but starts me V8.........mind you, doosul's are much higher compression, might need a bigger battery?

Dunno tho', I int a siontist!

The one in the bonnet is what it was supplied with.
Some pepole move the bat to under the passanger seat or add a second bat there for a split charge system.

Ps
Not sure how the Army did it with 24V systems.

i have a ****ing great battery unner me barnet its so big we don't stock them at work (i fink its orft a cargo lorry)

when u say split charge i assume that would mean two 6 volt batterys and mine is a deisel so i assume the bigger a battery i can get on the better

trunkneck said:

when u say split charge i assume that would mean two 6 volt batterys

Click to expand...

NO!

if no then what does he mean by split charge

Two batteries, one usually reserved for injun starting & t'other for ancillaries or a winch with a lecktirikery box that channels the lecktrik to the battery most in need when charging.

Like that: http://www.landroverweb.com/Pdf-files/Split-charge-relay.pdf

24v ffr landies had two batteries fitted inplace of the centre seat

Here's another thing. I'm only being so helpful onnacount of starting off so facetious!

Split charge?? - LR4x4 - The Land Rover Forum

thanks for taking the time to explain that its nice to be nice thanks again u have all been very helpful

It is quite possible that your vehicle if originally a diesel had two six volt batteries in series for starting purposes. So be careful on connecting up the batteries using the existing lead set up as you might end up with 24V which the electics wont like

Split charge batteries are TWO batteries that are both charged by the alternator, BUT .... the second one can be used by radios and winches and things till it goes flat, but that will NOT flatten the battery that starts the engine - so you don't get stuck.

CharlesY

I think the twin 6v battery set up was on Ser IIs. Ser IIIs had one 12v under the bonnet.

I had a 69 series 3 diesel with two batteries, mind you that might have been why it was so slow

a 1969 series 3?
they didn't make them then!

That would be a Ser II then.

I was thinking of adding a second battery under the seat, that is completely seperate to the existing battery, just to power my 4 spot lights as the alternator (only a puny 45amp) doesn't like them on for too long.

After reading this, what's stopping me connecting it in parallel to the current battery via a big HD switch so in the daytime it can be charging if i want it to be?

Also, what are the supposed problems with having a battery permanantly connected in parallel? As long as they're the save voltages i can't see a problem?